I own a 2000 beaver,33' patriot concord. I have a slight water leak at the bottom fitting going to drain. Pinhole type. The fitting going into tank is abs and has a flange that butts up to tank which is plastic. When they installed the fitting into the tank they used a clear sealant that is rock hard when dry. You can see where the applied it around the fitting. Now I have a 100 gal fresh wtr tank and recently purchased the coach, after buying i drained the tank, put some bleach in and filled with 100 gal which with the weight of 100 gal found a weak spot. I drained tank and its been sitting for over a week now completly dry. I am going to try and seal this small opening that is causing the leak. Has anybody expierienced this or knows of a good sealant to use. I have also been thinking about plastic welding.

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